Improvement in air-pumps



UNITED STATES PATENT OEEIcEa FRANKLIN RANSOM, OF BUFFALO, NEW YORK.

IMPROVEMENT |`N Al R-PUM Ps.

To all whom fit may concern:

Be it known that I, FRANKLIN RANsoM, of Buiialo, in the county of Erie and State of New York, have invented a new and useful Improvement in that the following is a full, clear, and exact description of the same, reference being had to the accompanyingdrawin g, formin g part of this speciiicatlon, said drawing representing a vertical section cfa pump with my improvement.'

This invention relates to air compressing or forcing pumps in which water or other liquid is interposed between the piston and the air.

Itconsists in anovelcombination and arrangement of 'the parts ot' the pump, whereby the construction is rendered v'ery simple and the operation very effective.

To enable others skilled in the art to make anduse my invention, I will proceed to describe it with reference to the drawing.

A is a hollow bed-plate having two openings, a and b,in the-top, overoneof which is arranged the upright pump-cylinder B, in which the piston F works, and over the other the suction air-chamber C, a constant communication between thc said cylinder and chamber beingthus provided through the bed-plate.

On the top ot' the suction-chamber O is arranged thc air-condensing chamber D, and between these two chambers is the delivery-valve o, which opensupward, and which may be either of the puppet or flap kind, but which is represented of the puppet kind.

Attached to one side ofthe lower part ofthe chamber O is the suction-pipe E, and at the connection of this pipe with the said chamber is the inlet or-suction valve d, which may be of the iiap or puppet kind, but is represented of the flap kind.

Such a quantity of water or other liquid is placed in the hollow bed-plate and chamber C, and in the cylinder B below the piston F, that when the piston is raised to its highest position (shown in the drawing) and the cylinder filled with water up to the bottom of the piston the level of the water in the chamber C will be such that the capacity of the said chamber above the said level will be somewhat less than that of the portion of the cylinder from which the water is displaced by the descent of the piston, and hence when the piston descends and forces the water from the cylinder through the bedplate andforces the air from the chamber O through the seat of the valve cinto the chamber D the chamber C will be filled with water, and a sufficient portion of the water will enter the Air-Pumps; and I do hereby declare chamberD to submerge the valve o to the depth of two or more inches, as shown in the drawing, in which thewater is represented 1n blue color. The lower valve, d, is so arranged that when the piston is in its highest position and the water in the chamber C at the lowest the said valve will be partly submerged, as shown in the drawing.

The operation is as follows: When the piston begins to rise the valve o closes andthe valve d opens, and as the piston moves upward the water decends in the chamber C and passes through the bed-plate into the cylinder B, in which it follows up ters the chamber O through the suction-pipe and lls the space above the water left by the descent of the latter. As the piston descends the water passes from the cylinder through the bed-plate into the chamber O, the valve d closes and the valve copens, andall the air is force by the rising water from the chamber C into the condensing-chamber D, piston rises again no air will remain in the chamber C to keep the valve closed by its expansive force. During the first part of the descent ofthe piston a portion of the water which was left in the lower part of the condensingchamber D at the termination of the previous 1 descent of the piston passes back through the open valve c; but this is replaced by what passes through the seat of the said valve during the next descent of the piston, so that the said valve is always perfectly sealedby the the piston, while air enso that when the x water against the return of any air when the` piston ascends. The valve d, being never entirel y uncovered by the water, and being cornpletely covered shortly after the commencement of the descent oi' the piston, is always perfectly sealed against the return of any air through the suction-pipe.

What I claim 'as myinvention, and desire to 1. Combining the elevated chamber O, hav

ing the valve d, as shown, with the pump-cyl- 

